Removing the selected class when drag little bit and placed the same potion #2390

Describe the bug

If I selected the first item and now second item slightly drag and placed the same position then selected class is removing even added index condition but not works

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior

Information

Versions - Look in your package.json for this information:
sortablejs = ^x.x.x
@types/sortablejs = ^x.x.x

Additional context
Add any other context about the problem here.

Reproduction
codesandbox: <your_url_here>